Total Syntheses of Novel Cytocidal .BETA.-Carboline Alkaloids, Oxopropalines D and G.

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  • ChemInform Abstract: Total Syntheses of Novel Cytocidal β‐Carboline Alkaloids, Oxopropalines D and G.

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A new type of β-carboline nucleus, N-methoxymethyl-4-methyl-β-carboline (4) was synthesized by thermal electrocyclic reaction of a 1-azahexatriene system, involving the indole 2, 3-bond. The key compound N-methoxymethyl-1-methoxycarbonyl-4-methyl-β-carboline (2) was then prepared in a four-step sequence. The total synthesis of oxopropaline G (1e) was achieved from this key compound in four steps. Furthermore, the enantioselective total syntheses of (+)-oxopropaline D (1c) and its enantiomer were also achieved by application of the Sharpless oxidation-procedure in nine steps from 2.

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